state that they have mastered the use of social media for propaganda purposes, to have somebody disenfran kised it is not a step to become radicalized, whether foreign fighters in iraq and syria or elsewhere or they are radicaliseed and they stay in belgium. this has been a problem >>> we know that the security forces are getting people away from the airport, making sure that nobody gets to the airport. from an investigation point of view what they immediately start to focus on right now? >> looking at the video cam grows going in and out of the airport. that's the first thing. there is going to be some part of a packaging, whether a suitcase, backpack will be left. it is going back and look at those videotapes and see if they can identify the individuals that brought those carriers in that had the explosive device. if they had tag metres near the airport, they will follow that up. they will get phone nourms, email address >>> let's just have a quick recap of what we know so far. there has been a possible explosion on the metro at a station. local media is saying the subway has been closed. the